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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Vermont CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Vermont CDL Manual. Take this practice test now to prepare for the actual VT CDL combination test!
1. What is the emergency air line for?
It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
It tells you the amount of brake pressure you need to stop the vehicle.
It controls theĀ front brakes of the tractor in case of an emergency.
2. Air brakes:
should be used only when driving on wet roads.
are an effective way to stop large and heavy vehicles.
are prohibited on larger vehicles.
3. A burning tire must be:
immediately removed from the vehicle.
cooled with water.
covered with cloth.
4. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
5. Brake fade results from, and is affected by:
brakes out of adjustment.
excessive heat caused by using the brakes too much.
All of the above.
6. Emergency brakes must be must be held on by:
mechanical force.
air pressure.
the locking mechanism.
7. If are being followed closely, you should:
increase your following distance.
change lanes quickly.
decrease your following distance.
8. To test the service brake:
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
push the brake pedal firmly while going about 5 mph.
gently try to pull forward with the trailer parking brake on, then release the brake.
9. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by feeling the brakes come on.
by recognizing tire failure.
10. When driving in very hot weather, the heat will increase the chances of:
tire failure.
loss of hydraulic pressure.
ABS malfunction.
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VT CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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